On Wed, Aug 20, 2025 at 5:22 PM Alan Grayson <[email protected]> wrote:
*>> If expanding space can't lengthen the wave length of light then what > does "expanding space" even mean? What is causing the cosmological red > shift that we observe? Why do objects that are at a larger distance from > the Earth have greater red shifts? * > *> The wave length of light? When you admit you have at best a very > imprecise definition of this concept, some progress might be possible. But > not until then. AG * *The wavelength of light (electromagnetic waves) produced by a microwave oven is defined as twice the distance between two melted points of a chocolate bar that had been heated in a microwave oven that was on a non-rotating plate. It works because the microwaves are in a box so they form a standing wave pattern inside the oven, and the waves interfere constructively every half wavelength and produce more heating at that point. **If you actually perform that experiment you'll find that the wavelength is 12.2 cm. * *If you find that definition is still "at best very imprecise" perhaps you could give me a better definition of "at best very imprecise" so I could give you a definition that was a bit better than at best less very imprecise.* *Incidentally you can use that same experiment to measure the speed of light, if you happen to know that all household microwave ovens operate at a frequency of 2.45 GHz, by using the simple formula c = fλ (where c is the speed of light, f is frequency, and λ is wavelength).* *John K Clark See what's on my new list at Extropolis <https://groups.google.com/g/extropolis>* rff > > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/CAJPayv0jdiCid38jrzS6GD%3DwtqHaP-SnA01X8qO4yHhSm5WcFg%40mail.gmail.com.
